126146721 has 4 divisors (see below), whose sum is σ = 168195632. Its totient is φ = 84097812.

The previous prime is 126146717. The next prime is 126146737. The reversal of 126146721 is 127641621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 126146721 - 2² = 126146717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126146771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21024451 + ... + 21024456.

It is an arithmetic number, because the mean of its divisors is an integer number (42048908).

Almost surely, 2^126146721 is an apocalyptic number.

It is an amenable number.

126146721 is a deficient number, since it is larger than the sum of its proper divisors (42048911).

126146721 is an equidigital number, since it uses as much as digits as its factorization.

126146721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42048910.

The product of its digits is 4032, while the sum is 30.

The square root of 126146721 is about 11231.5057316461. The cubic root of 126146721 is about 501.5243095716.

The spelling of 126146721 in words is "one hundred twenty-six million, one hundred forty-six thousand, seven hundred twenty-one".